Fastest Planet in Solar System: Mercury is the fastest planet in the solar system because it orbits the Sun at an incredible speed of about 47 km per second, completing one full revolution in just 88 ...

On January 5, 2005, astronomers at NASA discovered Eris, the second-largest dwarf planet in the solar system. Eris is just ...

The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have dubbed ...

Why Can't We Find Planet 9? Deep in the outer reaches of our solar system, far beyond Neptune and Pluto, something massive is hiding in the dark. Scientists call it "Planet 9." For decades, ...

Planet Y is the latest in a series of hypothetical solar system planets that scientists have proposed in recent years, all with slightly different characteristics but collectively believed to be ...

(CNN) — The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have ...

First detected in 2004, the dwarf planetHaumeaquickly stood out due to its rapid rotation and elongated form. But the 2017 ...

One of the interesting facts about our Solar System is how fast different planets spin on their axis. Earth takes about 24 hours to make a full rotation, but some planets spin much quicker, making ...

This image provided by NASA shows an artist's illustration of the Tess telescope. Astronomers have discovered six planets orbiting a bright nearby star in perfect rhythmic harmony. (AP) CAPE CANAVERAL ...

Our Sun’s outer atmosphere, the corona, is millions of degrees hotter than it should be, and no one knows why.